[gexiv2/wip/gio-fix: 1/2] gioio: Check size only once on open

[Jens Georg <jensgeorg src gnome org>]

commit 1e4679784589c16259094bff4e04f4356cfaf89a
Author: Jens Georg <mail jensge org>
Date:   Sat Oct 12 21:21:01 2019 +0200

    gioio: Check size only once on open
    
    Apparently the exiv2 code calls open/close quite often

 gexiv2/gexiv2-metadata.cpp | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/gexiv2/gexiv2-metadata.cpp b/gexiv2/gexiv2-metadata.cpp
index 9ea9a19..73e1538 100644
--- a/gexiv2/gexiv2-metadata.cpp
+++ b/gexiv2/gexiv2-metadata.cpp
@@ -66,6 +66,9 @@ public:
         if (_seekable == nullptr)
             return 0;
 
+        if (_size >= 0)
+            return 0;
+
         auto position = tell();
         seek (0, Exiv2::BasicIo::end);
         _size = tell();